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4 stroke
#11
Did you look at the Aerotwin AT972 turbo, 2 cyl., 4 stroke engine. 100 lbs, 65 hp, dry sump, can be installed vertical and horizontal.

http://www.aerotwinmotors.com/newpage...
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#12
And then there is the proven German Aixro, 4 stroke Rotary engine. Extremly smooth, tested in kart racing and now available as heli engine. Only 17kg heavy, producing 33 kw, 500 hours TBO.

http://www.aixro.de/produkte/

http://www.ezycopter.biz/rx-50.htm
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#13
Another rotary 4 stroke engine. Used in sailplanes and gyros in Europe. Produced in Austria. Comes in 55hp and 75hp, no vibration, 27 kg.

http://www.austroengine.at/products/r...
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#14
The Aerotwin was a bust. I had my Mosquito on hold for 6 months while I waited for John to try it. John said it had bad vibration so I went ahead with the MZ202. I kinda like the Yamaha 1000cc three cylinder but I need to get what I got in the air first.
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#15
33 kw divided by 749 watts per horsepower equals 44 HP. Not quite enough
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#16
I still think that the MZ202 with direct injection and oil injection would do well. How about it Leon?
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#17
Dkeith - 8/9/2010 11:51 AM

I still think that the MZ202 with direct injection and oil injection would do well. How about it Leon?

I am inclined to agree. Touring with my Mossie VH-XER, I find that people still have a negative reaction to the idea of a 2-stroke engine. I wonder why this is.

I had a lot of 2-stroke Japanese motorcycle time and never had a moment's drama. Those bikes are not around anymore, but not because there was anything wrong with power or reliability. They left the scene for other reasons.

I'd happily cross Auckland Harbour, with a 2-stroke engine, Blair, provided Kawasaki built it.
And I'd nervous about the same crossing, Tom, with a Jabiru.

Rob1
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#18
Rob Hall - 8/9/2010 12:28 AM

Dkeith - 8/9/2010 11:51 AM
... I find that people still have a negative reaction to the idea of a 2-stroke engine. I wonder why this is.

May have a lot to do with German research in the early and mid forties with regard to small aircraft, specifically helicopters ... unreliability of the small powerplants available at the time.

tyc
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